A mysterious and sometimes deadly type of heart failure that can strike otherwise healthy, expectant mothers late in pregnancy and leave them sick for life at last can be traced to faulty blood vessels in the heart, researchers reported. Zoltan Arany, HMS assistant professor of medicine at Beth Israel Deaconess Medical Center, is the senior author. Research by S. Ananth Karumanchi, HMS associate professor of medicine at Beth Israel Deaconess Medical Center, is also highlighted.